Busbar-less battery module and battery pack

Abstract

The present disclosure relates to the technical field of batteries, and specifically relates to a busbar-less battery module and a battery pack. The busbar-less battery module provided in the present disclosure includes a plurality of cells, and tabs are provided at both ends of each cell, and the interconnected cells are directly connected through the tabs, and an isolation component is provided between the adjacent cells. In the present disclosure, the tabs are directly connected, and omission of bus bars prevents the bus bar from blocking the high-temperature fume, so that the high-temperature fume may be exhausted in time when thermal runaway occurs. In the meantime, the tabs of the cell may be isolated to prevent adjacent tabs from contacting each other during operation and causing thermal runaway due to short circuit, thereby avoiding spread of heat at the tabs.

1 . A busbar-less battery module, comprising:
 a plurality of cells, wherein tabs are provided at both ends of each of the cells, and the interconnected cells are directly connected through the tabs, and an isolation component is provided between the adjacent cells.   
     
     
         2 . The busbar-less battery module according to  claim 1 , wherein the isolation component is a heat insulation plate, and the busbar-less battery module further comprises:
 an outer enclosing plate, which comprises two opposite side plates and two opposite end plates, and the end plates are arranged between the side plates;   wherein the heat insulation plate is arranged between the adjacent cells, a first end of each of the heat insulation plates is located in an area enclosed by the connected tabs for the adjacent cells, and a distance between a second end of each of the heat insulation plates and the end plate is smaller than a distance between the tab and the end plate.   
     
     
         3 . The busbar-less battery module according to  claim 2 , further comprising a spacer, wherein the spacer is arranged between the cells to divide the plurality of cells into a plurality of cell groups, each of the cell groups at least comprises two of the cells, a distance from a first end of the spacer to the end plate is smaller than a distance from the tab to the end plate, and second ends of the spacer are in the area enclosed by the connected tabs for the adjacent cells. 
     
     
         4 . The busbar-less battery module according to  claim 3 , wherein the spacer comprises a first spacer and a second spacer, the first spacer comprises a first frame and heat insulation layers on both sides of the first frame, the first frame is provided with a first grooved channel along a length direction to allow wires to pass through, and the second spacer comprises a second frame and heat insulation layers disposed on both sides of the second frame. 
     
     
         5 . The busbar-less battery module according to  claim 4 , wherein the tabs for the cells on both sides of the first spacer are welded through connectors; the tabs for the cells on both sides of the second spacer and the heat insulation plate are welded together. 
     
     
         6 . The busbar-less battery module according to  claim 4 , wherein both the first frame and the second frame are made of metal. 
     
     
         7 . The busbar-less battery module according to  claim 4 , wherein the first frame comprises partition plates and horizontal plates, the partition plates are arranged at intervals, the horizontal plates are arranged between the partition plates, and two ends of each of the horizontal plates are respectively connected to the partition plates, and the horizontal plates are arranged at intervals. 
     
     
         8 . The busbar-less battery module according to  claim 2 , wherein the end plate is provided with a plurality of exhaust holes, and the plurality of cells and the plurality of exhaust holes are provided in one-to-one correspondence. 
     
     
         9 . The busbar-less battery module according to  claim 8 , wherein reinforcing ribs are arranged in a space enclosed by the exhaust hole, and the reinforcing ribs are arranged at intervals along a length direction of the exhaust hole. 
     
     
         10 . The busbar-less battery module according to  claim 2 , wherein no insulation support is provided at the both ends of the cell. 
     
     
         11 . The busbar-less battery module according to  claim 1 , wherein the isolation component is a tab holder;
 the plurality of cells are connected in series or in parallel through the tabs;   the tab holder is arranged at one end of the cell, at least one end of the tab holder is connected to an output electrode, the tab holder comprises a wire harness area and a tab separation area connected to the wire harness area, the tab separation area is provided with a plurality of dividers, and the plurality of dividers are arranged at intervals to form connection holes, each of the connection holes is pierced with the tabs, and the tabs pierced through the same connection hole are directly fixed and connected to each other through bending and stacking.   
     
     
         12 . The busbar-less battery module according to  claim 11 , wherein the wire harness area is provided with a plurality of wire harness stoppers and a plurality of wire harness fixing posts, and one of the wire harness fixing posts is provided above each of the connection holes. 
     
     
         13 . The busbar-less battery module according to  claim 11 , further comprising a spacer, wherein the spacer is arranged between the cells to divide the plurality of the cells into a plurality of cell groups, and each of the cell groups at least comprises two of the cells. 
     
     
         14 . The busbar-less battery module according to  claim 13 , wherein the spacer comprises a first spacer and a second spacer, the first spacer is located in the middle of the battery module, and both sides of the first spacer are respectively provided with the second spacer, the first spacer comprises a first frame and heat insulation layers arranged on both sides of the first frame, and the first frame is provided with a first grooved channel along a length direction to allow wires to pass through, the second spacer comprises a second frame and heat insulation layers arranged on both sides of the second frame. 
     
     
         15 . The busbar-less battery module according to  claim 14 , wherein the tabs for the cells arranged on the both sides of the first spacer are welded by connectors; the tabs for the cells on both sides of the second spacer are welded to each other. 
     
     
         16 . The busbar-less battery module according to  claim 14 , wherein both the first frame and the second frame are made of metal. 
     
     
         17 . The busbar-less battery module according to  claim 14 , wherein the first frame comprises partition plates and horizontal plates, the partition plates are arranged at intervals, and the horizontal plates are arranged between the partition plates, both ends of each of the horizontal plates are respectively connected to the partition plates, and the horizontal plates are arranged at intervals to form the first grooved channel. 
     
     
         18 . The busbar-less battery module according to  claim 11 , further comprising an outer enclosing plate, wherein the outer enclosing plate comprises a top plate, a bottom plate, two opposite side plates and two opposite end plates, both ends of each of the end plates are respectively connected to the two side plates, the top plate, the bottom plate, the two end plates and the two side plates are connected to form a cavity for accommodating the cell, a plurality of exhaust holes are arranged on the end plates, and the plurality of cells and the plurality of exhaust holes are arranged in one-to-one correspondence. 
     
     
         19 . The busbar-less battery module according to  claim 18 , wherein reinforcing ribs are arranged in a space enclosed by the exhaust hole. 
     
     
         20 . A battery pack, comprising the busbar-less battery module according to  claim 1 .